🌐 Mailman 3 January 2012 - Tutor - python.org

Wave module
by Alex Krycek Feb. 12, 2015

Feb. 12, 2015

Hello, I'm trying to join two .wav files with the wave module. But when I try to use wave.open(filename, "rb") I receive the following error: Traceback (most recent call last): File "<stdin>", line 1, in <module> File "F:\PortablePython1.0\lib\wave.py", line 483, in open return Wave_read(f) File "F:\PortablePython1.0\lib\wave.py", line 162, in __init__ self.initfp(f) File "F:\PortablePython1.0\lib\wave.py", line 143, in initfp self._read_fmt_chunk(chunk) File "F:\PortablePython1.0\lib\wave.py", line 264, in _read_fmt_chunk raise Error, 'unknown format: %r' % (wFormatTag,) wave.Error: unknown format: 85 I read somewhere that there are various wave formats, only some supported by Python. Is this true? If so, is there any way I can convert my wave files into a supported kind? Thanks!

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unicode help
by Marilyn Davis Nov. 14, 2012

Nov. 14, 2012

Hi, I'm still on Python 2.6 and I'm trying to work some unicode handling. I've spent some hours on this snippet of code, trying to follow PEP 0263, since the error tells me to see it. I've tried other docs too and I am still clueless. The code works, except for the comment at the end. I would be very grateful for some help. #!/usr/bin/env python '''Unicode handling for 2.6. ''' class Currency(float): def __str__(self): value = self.__class__.symbol + float.__str__(self) return value class Yen(Currency): symbol = unichr(165) class Pound(Currency): symbol = unichr(163) def main(): y = Yen(100) print unicode(y) p = Pound(100) print unicode(p) main() """ ¥100.0 £100.0 """

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ASCII Conversion
by Michael Lewis Jan. 31, 2012

Jan. 31, 2012

I am trying to do a simple test but am not sure how to get around ASCII conversion of characters. I want to pass in y have the function test to see if y is an integer and print out a value if that integer satisfies the if statement. However, if I pass in a string, it's converted to ASCII and will still satisfy the if statement and print out value. How do I ensure that a string is caught as a ValueError instead of being converted? def TestY(y): try: y = int(y) except ValueError: pass if y < -1 or y > 1: value = 82 print value else: pass -- Michael J. Lewis mjolewis(a)gmail.com 415.815.7257

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Re: [Tutor] New user Knows nothing about python I Need HELP
by Joel Goldstick Jan. 30, 2012

Jan. 30, 2012

On Mon, Jan 30, 2012 at 5:41 PM, William Stewart <williamjstewart(a)rogers.com > wrote: > thanks I havent learned anything about prgramming its a computer sicence > class, I will try the links > thanks again > > --- On *Mon, 1/30/12, Joel Goldstick <joel.goldstick(a)gmail.com>* wrote: > > > From: Joel Goldstick <joel.goldstick(a)gmail.com> > Subject: Re: [Tutor] New user Knows nothing about python I Need HELP > To: "Jerry Hill" <malaclypse2(a)gmail.com> > Cc: "William Stewart" <williamjstewart(a)rogers.com>, tutor(a)python.org > Date: Monday, January 30, 2012, 3:00 PM > > > On Mon, Jan 30, 2012 at 2:21 PM, Jerry Hill <malaclypse2(a)gmail.com<http://ca.mc886.mail.yahoo.com/mc/compose?to=malaclypse2@gmail.com>> > wrote: > > On Mon, Jan 30, 2012 at 2:02 PM, William Stewart > > <williamjstewart(a)rogers.com<http://ca.mc886.mail.yahoo.com/mc/compose?to=williamjstewart@rogers.com>> > wrote: > >> I have no Idea how to start this task I have never used ANY programming > programs before And I dont Know the language either > >> The online help files from python Did not help a bit > > > > > > Here's a few resources that might get you started. > > > > First, if you haven't seen it, I found the official python tutorial to > > be a great place to start: http://docs.python.org/tutorial/ That may > > assume more familiarity with programming in general than you are > > comfortable with, though. > > > > In that case, you might be interested in a whole bunch of resources > > designed to teach python to people who haven't done any programming at > > all: http://wiki.python.org/moin/BeginnersGuide/NonProgrammers > > > > Once you're a bit more comfortable, there are a ton more documentation > > aimed at learning python for people who are already somewhat familiar > > with other programming languages: > > http://wiki.python.org/moin/BeginnersGuide/Programmers > > > > Hope that helps some, > > Jerry > > _______________________________________________ > > Tutor maillist - Tutor(a)python.org<http://ca.mc886.mail.yahoo.com/mc/compose?to=Tutor@python.org> > > To unsubscribe or change subscription options: > > http://mail.python.org/mailman/listinfo/tutor > > From the nature of your question, I am guessing you are taking a class > and this is homework? If so, can you tell us what you have learned so > far or what topics have been covered in your class? > > If this just for general interest. the resources above are a good start > > > -- > Joel Goldstick > > William, First, reply to all so that the group sees your response. Second, aside from the reading, find a classmate or two who are feeling like you are. python has an interactive shell that you get to by just typing python from a terminal prompt. When you go through a tutorial or examples, try things out in the shell. You'll learn a lot that way -- Joel Goldstick

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New user Knows nothing about python I Need HELP
by William Stewart Jan. 30, 2012

Jan. 30, 2012

hello I am trying to make a math functions program which includes ADDITION: 2+2=4 SUBTRACTION: 4-2=2 MULTIPLICATION: 4*2=8 DIVISION: 4/2=2 EXPONENT: 2**3=8 REMAINDER: 5%2=1 I have no Idea how to start this task I have never used ANY programming programs before And I dont Know the language either The online help files from python Did not help a bit please help thank you

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Sort
by George Nyoro Jan. 30, 2012

Jan. 30, 2012

Hey all, again: Thanks for the delete thing. Helped with that problem a lot. Especially the getattr thing came in handy. Question 1: How do you guys indent and put in the triple greater than signs and all that when sending mail? Manually? Coz the last mail I sent was using the gmail indent thing and it doesnt seem to have worked. Anyway: Question 2: I have this script that downloaded a lot of files from one server into one local directory and the files are named in a particular order and I want them to be opened in this very same order so that I can copy the contents of each to one main file and then convert to pdf. However, the naming schema is like this (Roman numerals in parts) and python doesn't seem to be able to sort it properly. 1.I.1; 1.I.2; ....; 1.I.20; 1.II.1.1;1.II.1.2 1.II.2;...1.II.10; 2.I.3; Because of the roman numerals that are always in the second part fo the filename, it could sort based on how I wanted. I listed all the files in the said directory: files=os.listdir(location) I tried using a sort algorithm that goes through the list starting from index 0 and then compares each index with the next one and if they are not arranged as they should be, the two are switched and then it starts again. The thing is, it is so slow! It hardly goes past index three in the list and there are so many files. *about fifty*. Could anyone help me with the python impelentation of such an algorith and how it should sort. Thanks.

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Re: [Tutor] Tutor Digest, Vol 95, Issue 80
by Arun Kumar Jan. 30, 2012

Jan. 30, 2012

Dear Ganesh, Glade is just an user interface builder. It is just a Rapid Application Development (RAD) tool that simplifies designing the user interface. But you still need to program what the interface does. This is done by PyGTK, a toolkit, or a collection of libraries, which developers can use to develop GUI applications for Linux, OSX, Windows, and any other platform on which GTK+ is available. I think this tutorial may be helpful to you. http://www.micahcarrick.com/gtk-glade-tutorial-part-1.html http://www.pygtk.org/pygtk2tutorial/index.html On Mon, Jan 30, 2012 at 1:23 PM, <tutor-request(a)python.org> wrote: > Send Tutor mailing list submissions to > tutor(a)python.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://mail.python.org/mailman/listinfo/tutor > or, via email, send a message with subject or body 'help' to > tutor-request(a)python.org > > You can reach the person managing the list at > tutor-owner(a)python.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Tutor digest..." > > > Today's Topics: > > 1. Re: Deleting an object (Peter Otten) > 2. Re: Deleting an object (Alan Gauld) > 3. Re: Socket Programming (Navneet) > 4. Re: Why do you have to close files? (amt) > 5. loop until a keypress (Surya K) > 6. Help Glade Tutorial. (Ganesh Kumar) > 7. Re: Help Glade Tutorial. (Chris Fuller) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sun, 29 Jan 2012 17:34:12 +0100 > From: Peter Otten <__peter__(a)web.de> > To: tutor(a)python.org > Subject: Re: [Tutor] Deleting an object > Message-ID: <jg3se3$seo$1(a)dough.gmane.org> > Content-Type: text/plain; charset="ISO-8859-1" > > George Nyoro wrote: > > > Last time I tried to post a question regarding this, I was asked > to > > clarify. Okay so here it is. There is a class called Table and objects > are > > just tables, you know, matrices, holding different types of data. Thing > > is, I want to provide a method where one can delete the object and then > if > > the user tries using a variable to access a certain method or attributes, > > he gets an error. Let me give an example; > > > > class Table: > > def delete_this(self): > > #code to delete this object or assign it null or None > > pass > > > > def do_something(self): > > pass > > > x=Table() > > x.delete_this() > > > > #at this point, I want such that if I try to use x I get some sort of > > #error > > e.g. > > > > x.do_something() > > > > #Error: x is definitely not an object anymore > > > > > > All clear? > > > >>> class Parrot: > ... def hello(self): > ... print("Hello") > ... def delete_this(self): > ... self.__class__ = DeadParrot > ... > >>> class DeadParrot: > ... def __getattr__(self, name): > ... raise Exception("This parrot is no more") > ... > >>> p = Parrot() > >>> p.hello() > Hello > >>> p.delete_this() > >>> p.hello() > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > File "<stdin>", line 3, in __getattr__ > Exception: This parrot is no more > > But I don't think it's a good idea... > > > > ------------------------------ > > Message: 2 > Date: Sun, 29 Jan 2012 18:05:59 +0000 > From: Alan Gauld <alan.gauld(a)btinternet.com> > To: tutor(a)python.org > Subject: Re: [Tutor] Deleting an object > Message-ID: <jg41q7$6lq$1(a)dough.gmane.org> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > On 29/01/12 15:14, George Nyoro wrote: > > > data. Thing is, I want to provide a method where one can delete the > > object and then if the user tries using a variable to access a certain > > method or attributes, he gets an error. Let me give an example; > > I assume you know about the built in del() function that deletes > objects? It works on any kind of object. > > If you need it to do sometjing fancy(like releasing resources say) you > can define your own __del__() method that gets called by Python when the > object is deleted - but you rarely need to do that in Python. > > > class Table: > > def delete_this(self): > > def do_something(self): > > > x=Table() > > x.delete_this() > > #at this point, I want such that if I try to use x I get some sort of > > error e.g. > > x = Table() > del(x) > > now referencing x or any attribute or method will give a name error. > Here is an example using an int, but any kind of object works: > > >>> x = 42 > >>> x > 42 > >>> del(x) > >>> x > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > NameError: name 'x' is not defined > >>> > > If thats not what you want you need to come vback and explain what is > different about your scenario. > > -- > Alan G > Author of the Learn to Program web site > http://www.alan-g.me.uk/ > > > > ------------------------------ > > Message: 3 > Date: Sun, 29 Jan 2012 21:01:47 +0100 > From: Navneet <rocklearnpython(a)gmail.com> > To: tutor(a)python.org > Subject: Re: [Tutor] Socket Programming > Message-ID: <4F25A5AB.5070903(a)gmail.com> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > On 1/27/2012 10:13 PM, Steven D'Aprano wrote: > > Navneet wrote: > > > >> One more thing I want to add here is, I am trying to create the GUI > >> based chat server.(Attached the programs.) > > > > > > Please do not send large chunks of code like this, unless asked. > > Instead, you should try to produce a minimal example that demonstrates > > the problem. It should be: > > > > * short (avoid code which has nothing to do with the problem) > > > > * self-contained (other people must be able to run it) > > > > * correct (it must actually fail in the way you say it fails) > > > > See here for more: http://sscce.org/ > > > > > > In cutting your code down to a minimal example, 9 times out of 10 you > > will solve your problem yourself, and learn something in the process. > > > > > >> bash-3.1$ python Client1.py > >> Enter the server address:...9009 > >> Traceback (most recent call last): > >> File "Client1.py", line 53, in <module> > >> c = ClientChat(serverport) > >> File "Client1.py", line 24, in __init__ > >> gui.callGui() > >> File "a:\FedEx\Exp\ClientGui.py", line 37, in callGui > >> sendbutton =Button(f2, width = 5, height = 2, text = "Send", > >> command = C.ClientChat.senddata()) > >> TypeError: unbound method senddata() must be called with ClientChat > >> instance as first argument (got nothing instead) > > > > > > This one is easy. You need to initialize a ClientChat instance first. > > This may be as simple as: > > > > command = C.ClientChat().senddata > > > > although I'm not sure if ClientChat requires any arguments. > > > > Note that you call the ClientChat class, to create an instance, but > > you DON'T call the senddata method, since you want to pass the method > > itself as a callback function. The button will call it for you, when > > needed. > > > > > > > Thanks for the clarification and telling me about SSCCE :) > > But just a simple thing,,, Can I call a method of another module while > creating a GUI. > > For example > C = Tk() > .....(Some more lines) > self.sendbutton =Button(self.f2, width = 5, height = 2, text = "Send", > command = <ANOTHER MODULE>.<METHOD OF THAT MODULE>) > self.sendbutton.pack(side = LEFT, padx = 10, pady = 10) > .....(Some more lines) > C.mainloop() > > > Because I am getting stuck in a loop. The client is keep on connecting > to server without creating a GUI. > > > > > > > > > > > > > > ------------------------------ > > Message: 4 > Date: Mon, 30 Jan 2012 00:28:21 +0200 > From: amt <0101amt(a)gmail.com> > To: tutor(a)python.org > Subject: Re: [Tutor] Why do you have to close files? > Message-ID: > <CAEQEn016afJDN+2F_+R-rm2d4MbWGXvN9_ed-AQoNmT=F2VKiQ(a)mail.gmail.com > > > Content-Type: text/plain; charset=ISO-8859-1 > > All the replies were very helpful! Thank you very much for helping me out! > > > ------------------------------ > > Message: 5 > Date: Mon, 30 Jan 2012 10:50:51 +0530 > From: Surya K <suryak(a)live.com> > To: Python Tutor <tutor(a)python.org> > Subject: [Tutor] loop until a keypress > Message-ID: <SNT130-W397E068F9E47ABD82EEA34A48D0(a)phx.gbl> > Content-Type: text/plain; charset="iso-8859-1" > > > I want to run code until a "enter" is pressed. Well, it shouldn't wait for > the user to enter "enter" > This is my code: > import msvcrtchr = 0while chr != 'q': print "my code", if > msvcrt.kbhit(): chr = msvcrt.getch() > This isn't working the way I wanted. When ever I press enter, the loop is > starting in a new line and continuing. > I even added "break" statement in "if" block but it isn't workingCan you > tell me how to do that? > I am on windows. So, as msvcrt is for windows, I wonder if there is any > module that works for both, >

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loop until a keypress
by Surya K Jan. 30, 2012

Jan. 30, 2012

I want to run code until a "enter" is pressed. Well, it shouldn't wait for the user to enter "enter" This is my code: import msvcrtchr = 0while chr != 'q': print "my code", if msvcrt.kbhit(): chr = msvcrt.getch() This isn't working the way I wanted. When ever I press enter, the loop is starting in a new line and continuing. I even added "break" statement in "if" block but it isn't workingCan you tell me how to do that? I am on windows. So, as msvcrt is for windows, I wonder if there is any module that works for both,

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Help Glade Tutorial.
by Ganesh Kumar Jan. 30, 2012

Jan. 30, 2012

Hi Guys, I am searching for a Glade tutorial, on how to create simple projects Glade with python 1) design a simple interface in glade 2) use the glade interface to write some really simple application with python. I search in goggled i didn't get good tutorials, guide me guys How to start with Glade. -Ganesh Did I learn something today? If not, I wasted it.

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Why do you have to close files?
by amt Jan. 29, 2012

Jan. 29, 2012

Exercise 17, extra credit 6 Learn python the hard way: Find out why you had to do output.close() in the code. Code: from sys import argv from os.path import exists script, from_file, to_file = argv print "Copying from %s to %s" % (from_file, to_file) input = open(from_file) indata = input.read() print "The input file is %d bytes long" % len(indata) print "Does the output file exist? %r" % exists(to_file) print "Ready, hit RETURN to continue, CTRL-C to abort." raw_input() output = open(to_file, 'w') output.write(indata) print "Alright, all done." output.close() input.close() I don't get it. If you don't close input and output it works exactly the same as if you would close them, so why do you have to do output.close() and input.close()? Also does it matter if you do: input.close() and then output.close()? Is there an order to follow? Thanks in advance, amt.

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